Google Image Labeller is a tool which has a game type interaction

How to do it?
You login with your google account, start the game and you and another person are presented with a random same image, you have to enter tags and keyword for the image and then google checks how may of the tags are matching with your partner and you score points for them!

Rules:
You have 90 seconds for one image, then you have to move on to another image. After the game you can check how many points you have scored and see the links of the images and the website they were taken from

What is it, what do i get?
You just finally end up increasing the relevance of the images you get on google image search. So when you get a very relevant image on your next search thank the person who tagged it

Access Google Image Labeller here.